Abstract
FIELD experiments were conducted in clay loam soil during two …. successive seasons 2010/2011 and 2011/2012 at the Agricultural Experimental station, Faculty of Agriculture, Cairo University to investigate the impact of 4 irrigation frequencies combined with three fertilizers as well as control treatment (without fertilizer) on actual evapotranspiration (ETa), grain yield (Triticum aestivum, L. Sids1) and water use efficiency (WUS) of wheat under furrow irrigation system and Giza region conditions. The results clearly revealed that increasing irrigation frequency significantly decreased seasonal ETa values during studied growing seasons. While the addition of inorganic and organic fertilizers to the studied soil significantly increased seasonal ETa compared to the control treatment (without fertilizers). The wheat crop irrigated by short irrigation interval ≤ 14 days with fertilization by combined between inorganic and organic fertilizers increased seasonal ETa values. While the wheat crop irrigated by the long irrigation interval of 18 days with separately organic fertilizer decreased seasonal ETa value. The results revealed that irrigation interval every 10 days with combined fertilizers treatment had the highest seasonal ETa value (44.56 cm) while the irrigation interval every 18 days with separately organic fertilizer had the lowest seasonal ETa value (37.79 cm) compared to the control treatment (without fertilizers) during studied growing seasons. The results noticed that
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